I am running symantec backup exec 2010 on a new dell R710 server. Networked via iSCSI to the server is a EQL SAN and a Dell TL4000 tape drive.

There are 5x 2TB backup to disk folders setup on the SAN, and BEX is supposed to run a duplicate job after the B2D job completes.

I am finding that when the B2D target drives are cleared of all data (B2D files), my throughput speeds on my duplicate B2T Tape offload jobs run at amazing speeds.

As time goes on and more B2D files are written on the B2D drives, my tape offload speeds drop dramitically. When running fine I am seeing speeds of 2.5GB/min, but they slow down daily and all jobs cannot get over 400MB/min, killing my time windows.

Symantec says BEX2010 isnt supported over iSCSI, Dell is saying the hardware is fine, and I think theres gotta be some configuration tweak to make this all work on a daily basis.

My B2D drives are only filling up about 30-40% before they are over-written.

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Are you running other jobs while backing up to tape? Could it be a bandwidth issue? I think with my TL4000 dell had to remove some built in Windows driver or Windows backup utility, but we were getting constant bad performance around 400mb. We ended up NIC Teaming our setup to get a performance boost.

The best I've managed to come up with so far is to set my B2D folders to allocate the maximum size for b2d files and disable buffered writes. I use two MD1000 arrays and this seems to have at least kept the speeds consistent...

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